NWL means New World Living, as in their translation of the Bible. So you are talking to an authentic JW here.
One good way to get rid of them, is to bring out a thick study Bible, some theology books and Greek language books. I did that, told them I was in Seminary, and they asked if I wanted to be on the "Do not call list" At that time, I was overwhelmed with my courses, so I said "yes!" I kind of miss them, because now I have the materials to win them to Christ.
So just ask to be put on it if you don't want to be bothered, and make sure you bring quite a few Bibles to the door. I have a really good answer for John 1:1 from the Greek, if anyone is interested in me writing it out by hand. It conclusively proves that the NWL Bible is wrong, and so are the JW's and that Jesus is God!
Not "a god", as in polytheism.